#include<stdio.h>
   int main()
 {
     int year,month;
   scanf("%d %d",&year,&month);
  if(((year%4==0 && year%100 !=0) || year%400==0 ) && month==2)
      printf("29\n");
   else if (month==1 || month==3 || month==5 || month==7 ||month==8 || month==10 || month==12)
      printf("31\n");
   else if (month==4 || month==6 || month==9 || month==11)
      printf("30\n");
   else
      printf("28\n");
   return 0;
 }
